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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a586b18923039569d8e0022cb310d40c26698825b7a33611d801f794bd4c7547' 
  AND token = '4uQ7bK5ONINq01RXg976v83yILHwfG2wH6kjNLdCuZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}